Synonym: Paxillus filamentosus.
Common name: alder rollrim.
Russian names: Svinushka olkhovaya, Svinushka osinovaya.
Paxillus rubicundulus is a species of fungus that belongs to the family Paxillaceae. It is a rare and poorly studied species. In St. Petersburg and Leningrad Oblast, it has been found in coniferous and mixed forests, typically growing on the ground or on decaying wood. In north-western Russia, it is considered a rare species, with limited records of its occurrence. The fungus has a reddish-brown to brown cap, 3-8 cm in diameter, and a stipe that is often curved or bent. Its spores are brown and ornamented with warts or reticulations.
Rotten caps of alder roll-rim mushrooms (Paxillus rubicundulus, Paxillus filamentosus, Russian name Svinushka) on roadside near Kavgolovskoe Lake, 12 miles north from Saint Petersburg. Russia, September 20, 2013
Yuzhnaya, 42, Toksovo, Leningrad Oblast, Russia
Alder roll-rim mushroom (Paxillus rubicundulus, Paxillus filamentosus, Russian name Svinushka) on roadside near Kavgolovskoe Lake, 12 miles north from Saint Petersburg. Russia, September 20, 2013Dachnaya, 17, Toksovo, Leningrad Oblast, Russia
Alder roll-rim mushrooms (Paxillus rubicundulus, Paxillus filamentosus, Russian name Svinushka) near Kavgolovskoe Lake in Toksovo, north from Saint Petersburg. Russia, July 24, 2016Dachnaya ul., Leningradskaya oblast', Russia, 188664
Alder roll-rim mushroom (Paxillus rubicundulus, Paxillus filamentosus, Russian name Svinushka) on roadside near Kavgolovskoe Lake. North from Saint Petersburg, Russia, September 21, 2016Novyy per., Kavgolovo, Leningradskaya oblast', Russia, 188667
Alder rollrim mushroom (Paxillus rubicundulus) on roadside in Yuntolovsky Park. Saint Petersburg, Russia, July 7, 2017Zapadniy Skorostnoy Diameter, Sankt-Peterburg, RussiaObservations of Paxillus rubicundulus in Leningrad Oblast and north-western Russia reveal the fungus's presence in various locations. The species was found near Kavgolovskoe Lake, 12 miles north from Saint Petersburg, on multiple occasions: September 20, 2013, with rotten caps; July 24, 2016, with multiple mushrooms; and September 21, 2016. Additionally, it was spotted in Toksovo, north of Saint Petersburg, and in Yuntolovsky Park, Saint Petersburg, on July 7, 2017. The fungus appears to thrive in roadside areas, suggesting a tolerance for disturbed environments. The observations span several years, indicating a consistent presence of Paxillus rubicundulus in the region. The species is often found associated with alder trees, as suggested by its common name, alder roll-rim mushroom.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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